Mining-drill



(No Model.) V

- J B. POWELL 80 W. D. LEWIS.

MINING DRILL.

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UNITED STATES PATENT OFFICE.

JOHN R. POWELL AND WILLIAM D. LEWIS, OF PLYMOUTH, PENNSYLVANIA.

MINING-DRILL.

SPECIFICATION forming part of Letters Patent N 0'. 358,479, dated March1, 1887.

(No model.)

To all whom, it may concern.-

Be it known that we, JOHN R. POWELL, a citizen of the United States, andWILLIAM D. LEWIS, a subject of the Queen of Great Britain, residing atPlymouth, in the county of Luzerne and State of Pennsylvania, haveinvented a new and useful Improvement in Mining-Drills for Coal andRock, of which the following is a specification.

Our invention relates to improvements in mining-drills for coal androck; and it consists of the peculiar construction and arrangement ofthe, various parts for service, and in the novel combination of devices,substantially as hereinafter fully set forth, and particularly pointedout in the claims.

Heretofore in this art it has been proposed to provide a mining-drillfor drilling rock and coal with toothed jaws for entering an aperture oropening formed in the rock, &c. to hold the frame and the drill steadilyin position. In some of these devices the jaws of the drill-frame areprovided with an adjustingbolt and binding-nuts which pass through thejaws; but in the practical use of a drill embodying this constructiononly one of the jaws is separated from the other and forced into theapertures or interstices of the-rock or coal, while the other jaw isfree and does not enter the coal, &c so that it is liable to turn orrotate partially, whereby the drill is insecurely held in place and thedrill is liable to cut untrue.

VVe are also aware that the togthed holdingjaws of a mining-drill havebeen hinged or pivotally connected together, and a wedge or key driveninto or between the jaws to separate them; but in this device it is verydifficult and tedious to withdraw the key or wedge from between the jawswhen the operation of drilling has been completed, so that the apparatuscan be removed or displaced; and weare further aware that the toothedjaws of a mining-drill have been pivotally supported at their middle byvertical plates and through one of the ends of these jaws is passed anadjusting-bolt having a binding-nut, and in this case the jaws do notforma supportand guide for the drill and its feed-shaft, which passesabove the jaws and exterior thereto.

The primary object of our invention is to provide an improvedminingdrill for drilling rock and coal with laterally-expansible jaws,which are forced apart or moved in opposite directions simultaneously bynovel and peculiar means, said jaws forming a guide and support for theauger or drill and its feed-shaft, and having sufficient elasticity tonormally hold them in contact or engagement-with the adjusting devices,so that they shall be ready at all times for instant use or adjustment.By this construction and arrangement of the jaws and their adjustingdevice we provide means which can be rapidly and easily adjusted toretain or hold the drill very firmly and rigidly in place, and at thesame time provide a secure support and guide for the drill and itsfeed-shaft.

A further object ofourinvention is to provide a firm and secure supportfor the threaded bearing of the feed-shaft for the auger or drill, whichbearing shall not be liable to turn or rotate on the drill-frame andthrow the auger and its feed-shaft out of line.

In the accompanying drawings, which i11ustrate a mining-drill embodyingour invention, Figure 1 is a perspective view. Fig. 2 is a plan viewshowing the jaws expanded in dot ted lines. Fig. 3 is a verticaltransverse sectional view on the line y y of Fig. 2. Fig. 4 is adetached perspective view of the bracket or support for the threaded boxor bearing of the feed-shaft. Fig. 5 is a detail View of our preferredform of wrench for simultaneously turning the adjusting-nuts. Fig.6 is acrosssectional view on the line at m, Fig. 2.

Referring to the drawings, in which like letters of reference denotecorresponding parts in all the figures, A and B designate the expansiblejaws of the supporting-frame of a mining-drill constructed in accordancewith our invention. These jaws are arranged side by side and parallelwith each other, or substantially so, and they are made of steel, iron,or other material of sufficient elasticity to adapt them to yield ormove laterally of each other and yet retain sufficient strength towithstand the strain and wear that comes upon the apparatus when inpractical use. The front ends of these expansible jaws AB are bent orinclined inwardly toward each other to form the shoulders or flanges a,and the said ends of the jaws are further bent to form the extensions b,that lie in close proximity to each other and have their inner opposingfaces or sides hollowed or curved out to form the support and guide 0for the drill or anger and its feed-shaft, presently described. TheguideC is thus formed or made integral with the jaws, and therebystrengthened and rendered more durable, and the extensions b, that formthe guides, are adapted to move laterally of each other with theirrespective jaws, so as to cause their spurs or teeth 0 to take or enterinto the interstices or apertures formed in the sides of the aperture oropening which is cut in the wall of rock or coal by a pick or othersuitable implement preparatory to introducing the extensions 1) of thejaws therein, as is obvious. These teeth or spurs are formed separateand secured to the extensions or guide, or they may be formed in onepiece therewith, and they are adapted to take in the interstices of thewall that forms the opening, so that thejaws which form the drill-frameare very securely and rigidly held in place, and thereby prevented frombecoming detached.

D designates a supplemental or auxiliary guide for the drill or angerand its feed-shaft, which is made in the form of an annulus or ring topermit the said auger and shaft to pass freely and readily therethrough.This guide D is located or arranged in a vertical position near thefront part of the frame or the jaws thereof and in rear of the shouldersthereon; and this guide is provided with outwardlyextended arms E E,which are arranged on opposite sides of the guide and enter or passthrough openings 0, formed in the jaws A B, as shown. These arms aremade of angular form in cross-section, preferably square, and theopenings 0 therefor are made of corresponding shape so that the lugs orarms are prevented from rotating or turning,whereby the guide is heldinits proper vertical position and in line with the guide 0, so that thedrill and its shaft can pass freely through both of the guides C D, asis obvious. These arms or lugs E E are threaded exteriorly, as shown,and the said threads run or incline in opposite directions, the one tothe right and the other to the left, so that when thenuts F thereon areturned they move in same direction by means of our preferred form ofwrench, (shown in Fig. 5,) and actuate the jaws A B simultaneously,whereby the teeth or spurs on the extensions I) of the j aws are causedto take into the interstices of the opening in the wall, and engage thesame to an equal extent to very firmly hold the jaws in place. The nutsF on the right and left hand threaded arms or lugs of the guides bearagainst the inner opposing sides of the expansible jaws, which arenormally in contact or engagement with the nuts by rcason of theirinherent elasticity, so that the device is in position or condition forinstant use at all times, and the nuts F are adapted to be rotatedsimultaneously and in the same directions by means of a wrench or othersuitable implement, our preferred form of which is shown in detail inFig. 5 of the drawings, although any other desired implement can beemployed.

It will be seen that when the nuts are rotated or turned by the wrenchto cause them tomove in one direction, they will bear against and forcethe jaws away from each other simultaneously without turning or rotatingthe supplemental guide D for the auger-shaft, which is prevented frommovement by reason of the angular lugs or arms E E being fitted snuglyor closely in the openings 6 provided therefor. \Vhen the nuts areturned in one direction,

, they force the jaws and their extensions 7) apart and cause the spursor teeth to take firmly into the wall, and when thenuts are rotated inthe reverse direction the inherent elasticityin the jaws closes themtogether and upon the nuts, so that the spurs or teeth are withdrawnfrom the wall, and the extensions a collapse to permit the apparatus tobe easily and readily removed.

The rear ends of the expansible jaws that form the frame of the drillare provided with enlargements g, which are formed integral with thejaws by swagtng the upper rear sides of the jaws, and on theseright-angled flanges g rests the bracketor support G for the bushing orbox of the feed-shalt of the drill. This bracket G comprises the sideplates, 71/, which bearand rest on the flanges g of the drill-frame, andare secured firmly and rigidly thereto by means of the throughbolts h,which pass through aligned openings in the flanges g and the plates h.The bracket G is provided, further, at one side with theupwardly-extended integral ears or lugs i, and on its oppositeside witha single perforated ear or lug, 1?, for a purpose presently described.

I designates a sectional box or hearing for the feed-shaft J, thatcarries the drill or anger J at its front end, the said feed-shaft beingexteriorly threaded, and both it and the anger or drill being of theordinary or any preferred pattern. One part or section of the box orbearing is formed in a single piece with the bracket or support Gbetween the lugs i and z" thereof, and the other part or section of thebearing is formed in a single piece with the cap-plate K, the said partsor sections being interiorly threaded and adapted to align or registerwith each other to permit the threaded periphery of the feed-shaft toengage the threads therein and be fed thereby when it is rotatedas, forinstance, by a crank or other suitable lever or device, L, affixed tothe shaft at one end, as shown herein. The cap-plate K is provided atone end with lugs or ears 7., which have transverse openings formedtherein, and said ears are fitted. between the lugsi of the bracket G,and the openings therein align with similar openings in the said lugs i,so that a shaft or pin can be passed therethrough to cured to the jaws,the sectional box or bearpivotally connect the bracket and cap-platestogether, as will be very readily understood. The opposite or free edgeof the cap-plate has a slot or opening, k, formed therein, and throughthis slot passes the lug i, so that a pin or key, m, can secure the freeend of the cap-plate and the bracket together detachably, whereby thecap-plate can be elevated or turned on its pivot to adapt the feed-shaftto be removed or adjusted, as is obvious. The pin or key m isconfined-to the cap-plate or other suitable part of the apparatus bymeans of a chain, rope, or other suitable connection, so that it is notliable to become detached. By means of the bracket-plate bearing on theright-angled lugs or flanges of the jaws a very firm and secure supportis provided for the said bracket, so that itis not liable to becomeeasily detached or displaced and throw the box or bearing I out of linewith the guides O D. The jaws are adapted to yield 'or spring from thepoint or line where the first of the throughbolts connects the bracket Gto the jaws. The feed-shaft passes and works through the threaded box orbearing I provided therefor, so that the drill or anger is fed forwardat a proper rate, and the drill passes through the guides O D, and isthereby correctly and properly guided and supported in place.

The operation of our invention will be readily understood from theforegoing description, taken in connection with the accompanyingdrawings.

By making the expansible jaws A B the basis for the drill-frame we areenabled to provide a drill which possesses superior advantages in pointsof strength, simplicity, durability, and cheapuess over all others thathave preceded it, and the supplemental guide D and the means foradjusting the jaws are likewise simple and strong in construction,effective, and rapidly operated, as well as cheap.

Slight changes in the form and proportion of parts can be made withoutdeparting from the spirit of our invention.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent. is

1. In a mining'drill, the combination of the expansible jaws providedwith the guide at their front ends and which is movable with the same,an auxiliary guide arranged in line with the guide of the jaws andhaving the right and left hand threaded studs fitted in openings in thejaws, and the adj usting-nuts fitted on the studs and bearing againstthe opposing sides of the jaws, the said nuts being capable of rotarymovement on the studs to move the jaws in reverse direction,substantially as described, for the purpose set forth.

2. In a mining-drill, the combination of the expansible jaws adapted tobe actuated simultaneously in opposite directions and having theright-angled flanges at their rear ends, the bracket-plate resting onthe flanges and seing, the guide D at the front of the jaws and havingthe right and left hand threaded lugs supported in thejaws, theadjusting-nuts fitted on the lugs and bearing against thejaws, and thefeed shaft carrying an anger, substantially as described.

3. The combination of the expansible jaws having the openings therein,the guide D, provided with the threaded lugs or arms substantiallysquare in cross-section and fitted snugly in the openings of the jaws,the adjustable nuts fitted on the lugs and impinging against the jaws toactuate the same simultaneously, the feed-shaft, and the auger carriedby the said shaft, substantially as described.

4. In a mining-drill, the combination of the laterally-expansible jawsprovided with the extensions at their front ends to form the guide C andhaving the projecting teeth or spurs on the outer surfaces of the saidextensions, the supplemental guide D, arranged in line with the frontguide, 0, and having the right and left hand threaded square studsfitting in aligned openings in the said jaws to prevent displacement ofthe supplemental guide, the nuts fitted and working in oppositedirections on the said threaded lugs and bearing against the opposingsides of the jaws, a fixed threaded bearing arranged upon thejaws inrear of and in line with the front and supplemental guides G D, thefeed-shaft working in the fixed threaded bearing, and the drill or angerconnected with the feed-shalt and passing through the aligned front andsupplemental guides, substantially as described, for the purpose setforth.

5. In a mining-drill, the combination of the expansiblejaws having theguide at their front ends, a supplemental guide arranged and held inline with the guide of the arms and provided with the threaded lugssupported in the arms, the adjusting-nuts movable in opposite directionson the lugs and bearing against the jaws to actuate them simultaneouslyin opposite directions, the feed-shaft, and the auger passing throughthe guide of the jaws and the supplemental guide, substantially asdescribed.

6. In a mining-drill, the combination of the expansible jaws forming thedrill-frame and having the integral extensions 1) at their front ends,provided with the inner rounded faces and the toothed periphery, thesupplemental guide arranged in line with the opening or passage formedby the rounded faces of the extensions and having the threaded lugssupported in the jaws, the nuts fitted on the lugs, the bracket-plateresting on and secured to flanges or ledges of the drill-frame, thecapplate pivotally connected with the bracket, the sectional box orbearing, the feed-shaft, and the auger ordrill, substantially asdescribed. i

7. In a mining-drill, the combination, with the expansiblej aws, of theoppositely-th readed In testimony that we claim the foregoing as 10studs or shaft fitted in the jaws, and the nuts our own we have heretoaflixed our signatures fitted 0n the oppositely-threaded portions of inpresence of two witnesses.

the studs or shaft and impinging against the 5 opposing sides of thejaws, the nuts being capable of rotation in the same direetionsi- Imuitaneously to force the jaws in opposite directions, substantially asdescribed, for the purpose set forth.

\Vitnesses:

W. P. DAVIS, J AMES \VARD.

